Address Early Adpoter's feedback

This PR addresses all of the points in the feedback as discussed in #8, for @honzajavorek to review & merge
@pksunkara thanks for clarifying my initial remark, yes, that's what I meant. @zdne thanks for fixing.

Regarding `one of` - what you are showing is something that completely passed around me so far :-o Don't know how that's possible, but thank you for clarifying this. Now the `group` makes sense, of course.